Employee retirement benefits (Tables)

3 Months Ended

Mar. 31, 2013

Schedule Of Components Of Net Benefit Cost

The components of net benefit cost were as follows:

	Three Months to March 31
millions of dollars	2013			2012
Pension benefits:
Current service cost		45			39
Interest cost		70			72
Expected return on plan assets		(82	)		(72)
Amortization of prior service cost		6			5
Amortization of actuarial loss		60			57
Net benefit cost		99			101
Other post-retirement benefits:
Current service cost		3			2
Interest cost		5			5
Amortization of actuarial loss		3			2
Net benefit cost		11			9